10 A power cut plunged ­performers into darkness in Luxembourg in 1962.

11 The 1963 contest was held in the UK to show off the new BBC Television Centre.

12 There was a scandal that year, when Switzerland and Denmark were neck and neck but Norway changed its vote at the last minute, letting Denmark win.

13 There have been five UK Eurovision winners so far – Sandy Shaw with Puppet on a String in 1967, Lulu with Boom Bang-a-Bang in 1969, Brotherhood of Man with Save Your Kisses For Me in 1976, Bucks Fizz with Making Your Mind Up in 1981 and Katrina and The Waves with Love Shine A Light in 1997.

14 We have finished as runners-up a record 15 times.

15 The first non-ballad song to win, for Luxembourg in 1965, was Poupée de Cire, Poupée de Son. It means Wax Doll, Rag Doll.

Waterloo: Abba congratulating each other in Brighton after winning the 1974 contest (Image: PA)

16 Puppet on a String was picked as Britain’s 1967 entry on The Rolf Harris Show.

17 Sandy was reluctant to take part but was persuaded it would boost her flagging career.

18 Northern Ireland’s Clodagh Rodgers had IRA death threats when she sang for Britain in Dublin in 1971.

19 The show was threatened by Palestinian terrorists when Israel first took part in 1973.